After the 1986 merger of Soo Line, Milwaukee Road, and Minneapolis, Northfield & Southern, a system-wide renumbering of locomotives was proposed. However, due to the purchase of the Soo by CP in 1990, and the retirement of many former Milwaukee Road units, the renumbering never occurred (with some exceptions, shown in bold type). For historical reasons, I have chosen to present the roster as it would have been. Some data courtesy Soo Line Railroad, Soo Line Historical & Technical Society, and Trains magazine.
Disposition (as of 1999) | ||||||
| SOO | 409 | 409 | GP9 | EMD | 1955 | wrecked before merger, retired |
| SOO | 500A | 500A | FP7A | EMD | 1950 | snowplow service, To Ladysmith, WI |
| SOO | 502A | 502A | FP7A | EMD | 1951 | snowplow service, to Chrome |
| SOO | 700-721 | 700-721 | GP30 | EMD | 1963 | to Wisconsin Central |
| SOO | 722-724, 726-731 | 722-724, 726-731 | GP35 | EMD | 1964-65 | various dispositions |
| SOO | 2112-2115, 2117-2119 | 1000-1006 | SW9 | EMD | 1952-53 | 2118 to slug 2118; others various dispositions |
| SOO | 321-328 | 1100-1107 | SW1200 | EMD | 1954-55 | various dispositions |
| SOO | 2120-2127 | 1108-1115 | SW1200 | EMD | 1955 | various dispositions |
| MNS | 30-35 | 1200-1205 | SW1200 | EMD | 1962-65 | various dispositions |
| MILW | 701-717 | 1206-1222 | SW1200 | EMD | 1954 | various dispositions |
| MNS | 36-37 | 1400-1401 | SW1500 | EMD | 1966 | |
| MILW | 434-497 | 1500-1563 | MP15AC | EMD | 1975-76 | 1500-1531 to UP (1991) |
| SOO | 2201A | 2201A | F7A | EMD | 1949 | snowplow service, to Chrome |
| SOO | 2381 | 2381 | SD9 | EMD | 1954 | to NRE |
| SOO | 2500A | 2500A | FP7A | EMD | 1950 | snowplow service, to LSMT |
| SOO | 2556 | 2556 | GP9 | EMD | 1950 | to Railway Systems |
| SOO | 375-378, 381-383 | 3900-3906 | GP7 | EMD | 1951-52 | various dispositions |
| SOO | 4000-4003 | 4000-4003 | Fuel Tender | Soo Line | 1989 | converted from ex-MILW GP40s |
| SOO | 400-405, 408, 410-412, 414 | 4200-4211 | GP9 | EMD | 1954-57 | various dispositions |
| SOO | 2401-2413 | 4212-4224 | GP9 | EMD | 1954-57 | various dispositions |
| SOO | 550-558 | 4225-4233 | GP9 | EMD | 1954-56 | various dispositions |
| SOO | 2550-2553, 2555 | 4234-4238 | GP9 | EMD | 1954-55 | various dispositions |
| MILW | 946-981 | 4300-4335 | GP20 | EMD | 1954-1958 | various dispositions, many to CC&P |
| UP | 832, 828, 805 | 4300:2-4302:2 | GP30C | EMD/Generation II | 1962/1990 | to TC&W (1999) |
| SOO | 4400-4407, 4409-4429, 4431-4452 | 4400-4407, 4409-4429, 4431-4452 | GP38-2 | EMD | 1977-83 | |
| MILW | 350-365 | 4500-4515 | GP38-2 | EMD | 1973-74 | 4500-4505 off roster |
| KCC | 793-794 | 4598-4599 | GP39-2 | EMD | 1989 | |
| SOO | 732-735 | 4600-4603 | GP40 | EMD | 1967 | 4102 off roster |
| MILW | 2000---2067* | 4604-4660 | GP40 | EMD | 1966-69 | some renumbered |
| SOO | 6000-6057 | 6000-6057 | SD60 | EMD | 1987-89 | |
| SOO | 6058-6062 | 6058-6062 | SD60M | EMD | 1989 | |
| MILW | 532, 534, 543-561 | 6100-6120 | SD10 | EMD/MILW | 1952-54 | to DM&E |
| MILW | 582-590 | 6200-6208 | SDL39 | EMD | 1969-72 | to Wisconsin Central |
| MNS | 40-41 | 6240-6241 | SD39 | EMD | 1968 | |
| MILW | 16---209* | 6300-6388 | SD40-2 | EMD | 1972-74 | various dispositions, many to NdeM, some renumbered |
| KCS | 622-627 | 6400-6405 | SD40 | EMD | 1986 | |
| HLCX | 5019-5023 | 6406-6410 | SD40A | EMD | 1987 | |
| MK | 7500 | 6411 | SD40 | EMD | 1987 | |
| BN | 7600 | 6450 | SD40B | EMD/BN | 1987 | |
| BN | 6678, 6659 | 6491-6492 | SD45 | EMD | 1987 | retired |
| SOO | 737-756 | 6600-6619 | SD40 | EMD | 1969-71 | |
| SOO | 757-765, 767-781, 783-789 | 6620-6650 | SD40-2 | EMD | 1972-75 | |
| SOO | 6601-6604, 6606-6623 | 6651-6672 | SD40-2 | EMD | 1979-1984 |
Notes:
*=non-continuous series; units not sequentially renumbered